R语言数据包自带数据集之mtcars数据集字段解释、数据导入实战

目录

R语言数据包自带数据集之mtcars数据集字段解释、数据导入实战

#会用帮助？或者help函数

#字段说明

#导入包

#导入数据

Format

Note

---

#会用帮助？或者help函数

内置的mtcars数据框包含有关32辆汽车的信息，包括它们的重量，燃油效率（以每加仑英里为单位），速度等。

要了解有关数据集的更多信息，请使用help(mtcars)。

#字段说明

数据来自1974年美国汽车趋势杂志，包括32辆汽车（1973-74款）的油耗和10个方面的汽车设计和性能。

format

A data frame with 32 observations on 11 (numeric) variables.

[, 1]	mpg	Miles/(US) gallon ：每加仑油能跑多少英里
[, 2]	cyl	Number of cylinders：气缸的个数
[, 3]	disp	Displacement (cu.in.)：车的排量
[, 4]	hp	Gross horsepower：总马力
[, 5]	drat	Rear axle ratio：后轴比
[, 6]	wt	Weight (1000 lbs)：重量
[, 7]	qsec	1/4 mile time：衡量启动加速能力
[, 8]	vs	Engine (0 = V-shaped, 1 = straight)：引擎类型
[, 9]	am	Transmission (0 = automatic, 1 = manual)：传动方式，自动变速还是手动变速
[,10]	gear	Number of forward gears：前进齿轮数
[,11]	carb	Number of carburetors：化油器个数

#导入包

# 导入R内自带的ToothGrowth数据集
library(datasets)
data(mtcars)

#导入数据

str(mtcars)
head(mtcars)

---

Format

A data frame with 32 observations on 11 (numeric) variables.

[, 1]	mpg	Miles/(US) gallon
[, 2]	cyl	Number of cylinders
[, 3]	disp	Displacement (cu.in.)
[, 4]	hp	Gross horsepower
[, 5]	drat	Rear axle ratio
[, 6]	wt	Weight (1000 lbs)
[, 7]	qsec	1/4 mile time
[, 8]	vs	Engine (0 = V-shaped, 1 = straight)
[, 9]	am	Transmission (0 = automatic, 1 = manual)
[,10]	gear	Number of forward gears
[,11]	carb	Number of carburetors

Note

Henderson and Velleman (1981) comment in a footnote to Table 1: ‘Hocking [original transcriber]'s noncrucial coding of the Mazda's rotary engine as a straight six-cylinder engine and the Porsche's flat engine as a V engine, as well as the inclusion of the diesel Mercedes 240D, have been retained to enable direct comparisons to be made with previous analyses.’

 

参考：R

参考：基础-R内置数据集

参考：[R语言]dataset数据包信息汇总